const fs = require('fs')
fs.readFile('./files/1.txt', 'utf8', (err, dataStr) => {
    console.log(err, dataStr, '1')
    if(err){
        return console.log('文件读取失败','1')
    }
    console.log('文件读取成功','1')
})
fs.readFile('./files/11.txt', 'utf8', (err, dataStr) => {

    console.log(err, dataStr, '2')
    if(err){
        return console.log('文件读取失败','2')
    }
    console.log('文件读取成功','2')
})